超電導マグネット材料としてのNb-Zr合金の研究

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タイトル別名
  • Metallurgical Aspects and Superconducting Current Capacities of Nb-Zr Alloys
  • チョウデンドウマグネット ザイリョウ ト シテ ノ Nb-Zr ゴウキン ノ ケンキュウ

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抄録

Nb-Zr alloys containing 28 to 57 at% Zr were fabricated into strips 5/100 mm in thickness and also into wires 0.25 mm in diameter. The cold workability of these alloys was improved by high vacuum electron beam melting and by forging at high temperatures. Phase transformation during various heat treatments was studied by X-ray diffraction method and the results agreed with those of Rogers et al. Specimens come to have fine lamellar structures after the eutectoid reaction at 560°C or after the decomposition into two b.c.c. phases at 785°C. The latter heat treatment at 785°C decreases the hardness and facilitates subsequent cold working at room temperature. The heat treatment at 560°C deteriorates the cold workability. The superconducting critical current Ic is increased considerably by cold working and is also sensitive to heat treatments. The decomposition reaction at 785°C and the eutectoid reaction at 560°C are both effective in increasing Ic, whether the specimen is cold worked or not. The intermediate heat treatment at 785°C for about 10 hr between successive cold working is quite profitable because of the improvement of both cold workability and superconducting current capacity.

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